Space-time adaptive control of femtosecond pulses amplified in a multimode fiber

Ultrashort light pulse transport and amplification in a 1.3 m long step-index multimode fiber with gain and with weak coupling has been investigated. An adaptive shaping of the input wavefront, only based on the output intensity pattern, has led to an amplified pulse focused both in space (1/32) and...

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Bibliographic Details
Published in:Optics express 2018-04, Vol.26 (8), p.10682-10690
Main Authors: Florentin, Raphaël, Kermene, Vincent, Desfarges-Berthelemot, Agnès, Barthelemy, Alain
Format: Article
Language:English
Subjects:
Optics
Physics
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Summary:Ultrashort light pulse transport and amplification in a 1.3 m long step-index multimode fiber with gain and with weak coupling has been investigated. An adaptive shaping of the input wavefront, only based on the output intensity pattern, has led to an amplified pulse focused both in space (1/32) and in time (1/10) despite a strong modal group delay dispersion. Optimization of the input owing to the two-photon detection of the amplified signal permitted to excite the fastest and more intense principal mode of the fiber and to get an output pulse duration limited by group velocity dispersion.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.26.010682